changes:- shel_write(SWM_LAUNCH) set the caller to the dir where the binary of the called app is (and back).
new: - implement SHW_SINGLE (needs a new kernel)- program can be run single-mode when a ^ is prepended before the name in the launcher
fixes: - clean up parameter-passing from the launcher - improve redraws in single-mode - improve boot_focus -- Helmut Karlowski